framework/threads.py: Conform to PEP8 style guidelines
framework/patterns.py: conform to PEP8 style
framework/exectest.py: Conform to PEP8 style guidelines
framework/shader_test.py: remove spurious import

Currently shader_test.py contains 'import os.path as path' and 'import
os.path'. The patch removes the to call to os.path and replaces its uses
with simply path.
framework/shader_test.py: Conform to PEP8 style guidelines
framework/summary.py: Conform to PEP8 style guidelines